Found it. It's F6 using Everest

I installed Everest and got to show. using tab doesn't work in level, in the map or nowhere. Can you help me ?

Thanks a lot. How do you get in debug mode btw ?

Hey ! I'm a new Celeste runner, and I mainly run C-sides category (single level). Is there a way to autosplit between each 3 screens of the level ? That would allow me to test out different techniques and get golden splits with it.

It may have to do with the "Enter level" in the autosplit maybe ?